Skimmer scoop



1932- E. R. ,STANDFUSS SKIMMER SCOOP Filed Dec. 9, 1929 Patented Oct. 18, 1932 UNHTED STATES PAT ERNER'" s r OFFICE OORPQRATION,OF MILWAUKEE, WISCOHSIN, A CORPORATION OF WISCONSIN SKIMMER SCOOP Application filed December 9, 1929. Serial No. 412,650.

Skimmer scoops as widely employed, com-' prises a boom supported-at one end on the revolvable platform of the excavator for rais-' ing and lowering movement under the influence of a power operated hoisting tackle. In operative position the boom is horizontally disposed and the skimmer bucket, which is supported for movement longitudinally of and along the boom is pulled outwardly by means of a digging line connected to a digging drum on the platform and extended out and around the guide or digging sheave at the outer end of the boom and back to the bucket. The boom is usually made up of longitudinal channels or angles which are held in spaced relation by a suitable latticing or cross bracing. To support the bucket on the boom, rollers carried by the bucket sides engage exposed longitudinal flanges or tracks provided along the upper and lower sides of the boom. In digging old paving, particularly asphalt paving, slabs of the asphalt curl up in the body of the bucket and are forced up through the open top of the bucket and against the undersideof the boom and against the lower exposec tracks on which the rollers bear with the result that the rollers are frequently jammed and the cross bracing or latticing of the boom is bent or otherwise injured.

One of the principal objects of the present invention is to provide a skimmer scoop which so handles and controls the material excavated and particularly slabs of asphalt or the like as to cause them to be deflected into the body of the bucket and prevent them from striking or damaging the boom or its cross bracing or jamming or binding the rollers which support the bucket for 1ts long1tu-- dinal travel.

Another ob ect of the invention is to provide a skimmer scoop having these advantages and capacities and which is of simple and durable construction, reliable and elfective in operation and easy and comparatively inexpensive to manufacture.

Other objects and advantages reside in certain novel features of the construction, arrangement and combination of parts, which will be hereinafter more fully described and particularly pointed out in the appended claim,reference being had to the accompanying drawing, forming the subject matter of this specification and in which: 7 Figure 1 is a view in side elevationshowing a skimmer scoop embodying the present invention;

Figure 2 is a view of the bucket in top plan with the adjacent portion of theboom broken away and shown in horizontal cross section for the sake of illustration;

Figure 3 is a view in vertical section taken on line 33 of Figure 1.

Referring to the drawing, and more-particularly to Figure 1, the numeral 1 designates the revolving platform of an excavatorsupported in accordance with the usual practice of a truck 2 which has the usual selflaying tracks or endless flexible treads 3.

A boom designated generally at 4 is provided and consists of spaced side channels 5 interconnected in any appropriate manner as by means of cross'braces or latticing 6. The rearward end of the boom 4 is angled slightly with respect to the major portion thereof as indicated at 4" and" is pivotally supported as at 7 on the revolving platform. The boomis also reinforced and strengthened v by a truss 8 which overlies the boom and is interconnected therewith in the manner shown in Figure 1. For raising and lowertackle 10 is provided and coacts with and ported on the truss 8.

As clearly shown in Figure 3 the out wardly directed flanges 12 and 13 of theside channels 5 of the boom, are providedwith wear strips 14 on their inner or confronting faces, thesewear strips providing tracks for the rollers of the skimmer bucket designated generally at 1,5, as willbezhereinafter more fully described.

The skimmer bucket 15 includes a body .16 having'theusual sides and back and a drop.

bottom 17 pivotally supported atits lower ing the boom, a power operating hoisting L exerts its lift upon a sheave 11 rotatably-sup- I with the top 22 is a pair of boom.

end on the side of the body 16 as indicated at 17. The drop bottom 17 carries exca vating teeth designated generally at 18.

For releasably securing the drop bottom 17 in closed position a latch mechanism designated generally at 20 is provided and is carried at the back of the bucket. This latch mechanism may be of any suitable construction, as for example of the type shown in the Patent 1,7 25,858 granted August 27, 1929, to Joseph Esters and Johannes S. Huber, or a modification thereof. As the latch mechanism per se forms no part of the invention it will not be described in detail.

A top designated generally at 22 is provided for the bucket and may consist of suitable castingribbed and webbed, as illustrated in Figures 2 and 3, to strengthen it and also cut out to lighten the structure of the same. However, this top is sufficiently continuous to deflect into the body of the bucket slabs of asphalt or other paving or other material excavated and also to prevent the slabs and the like from striking or injuring the boom or jamming the rollers. The underside of the casting constituting the top 22 is preferably smooth and the ribs and webs occur entirely on the upper side. As will be understood from Figure 3, the top 22 is located within the bucket body and is riveted, welded, or otherwise suitably secured to the sides and backs of the body 16 thereof. Integral side frames or brackets 24 which'project upwardly from the top and which in the assembly are located along the outside of the channels 5 of the Each of these brackets 24 supports a pair of upper rollers 25 and a pair of lower rollers '26, the rollers having their pintles or pins 27 supported on the brackets 24 and being freely rotatable. The arrangement of the rollers 25 and 26 is such that the rollers 25 engage beneath the wear strips 14 of the upper flanges 12 while the lower rollers 26 ride on the wear strips 14 of the lower flanges 13. As the rollers operate within or between the flanges of the side channels 5 of the boom and coact with the inner or confronting portions thereof, they are protected to a large extent by the boom structure. Further, the top of the bucket precludes the material being excavated from being forced up into the region of the rollers and thus protects the rollers against binding as well as the boom against injury.

Digging movement is imparted to the bucket by means of a digging line 30 connected as at 31 to the top of the bucket, extending around a digging sheave 32 at the outer end of the boom, and back over a guide sheave 33 rotatably supported by suitable brackets on the boom to a digging drum 34 mounted on the revolving platform 1 and driven in any suitable manner by the power plant of the machine.

loadedthe horn is usually elevated under the influence of a hoisting tackle 10 and the platform 1 is swung to bring the bucket over the wagon or the other point of discharge and the latch 20 is then tripped whereupon the drop bottom 17 swings about its pivot 17 and the contents of the bucket are discharged. The bucket is returned to its starting position under the action of gravity by paying out on the digging line 30 with the boom inclined so that the weight of the bucket causes it to ride back down along the boom until its back strikes the cushion bumper 40.

The invention claimed is:

A shovel of the skimmer type comprising a boom including side channels and cross bracing between" the channels for holding them in spaced relation, said channels having outwardly directed flanges having their confronting portions adapted to provide upper and lower tracks, a skimmer bucket having a top for deflecting excavating material in the body of the bucket, brackets connected to the top of the bucket and projecting upwardly from the top thereof and disposed alongside of the channels of the boom, and upper and lower rollers carried by said brackets and disposed in between the flanges of the channels and engaged with the upper and lower tracks thereof respectively, the rollers engaged with one track being spaced from and out of engagement with the other track.

In witness whereof, I hereto aflix my signature.

ERNEST R. STANDFUSS.

iii) 

